class Ldap # Class for handling LDAP GUIDs. # strongly inspired by # https://gist.github.com/astockwell/359c950fbc650c339eea # Big thanks to @astockwell class Guid # Checks if the given string is a valid GUID. # # @param string [String] The string that should be checked for valid GUID format. # # @example # Ldap::Guid.valid?('f742b361-32c6-4a92-baaa-eaae7df657ee') # #=> true # # @return [Boolean] def self.valid?(string) string.match?(/\w{8}\-\w{4}\-\w{4}\-\w{4}\-\w+/) end # Convers a given GUID string into the HEX equivalent. # # @param string [String] The GUID string that should converted into HEX. # # @example # Ldap::Guid.hex('f742b361-32c6-4a92-baaa-eaae7df657ee') # #=> "a\xB3B\xF7\xC62\x92J\xBA\xAA\xEA\xAE}\xF6W\xEE".b # # @return [String] The HEX equivalent of the given GUID string. def self.hex(string) new(string).hex end # Convers a given HEX string into the GUID equivalent. # # @param string [String] The HEX string that should converted into a GUID. # # @example # Ldap::Guid.string("a\xB3B\xF7\xC62\x92J\xBA\xAA\xEA\xAE}\xF6W\xEE".b) # #=> 'f742b361-32c6-4a92-baaa-eaae7df657ee' # # @return [String] The GUID equivalent of the given HEX string. def self.string(hex) new(hex).string end # Initializes an instance for the LDAP::Guid class to convert from/to HEX and GUID strings. # # @param string [String] The HEX or GUID string that should converted. # # @example # guid = Ldap::Guid.new('f742b361-32c6-4a92-baaa-eaae7df657ee') # # @return [nil] def initialize(guid) @guid = guid end # Convers the GUID string into the HEX equivalent. # # @example # guid.hex # #=> "a\xB3B\xF7\xC62\x92J\xBA\xAA\xEA\xAE}\xF6W\xEE".b # # @return [String] The HEX equivalent of the GUID string. def hex [oracle_raw16(guid)].pack('H*') end # Convers the HEX string into the GUID equivalent. # # @example # guid.string # #=> 'f742b361-32c6-4a92-baaa-eaae7df657ee' # # @return [String] The GUID equivalent of the HEX string. def string oracle_raw16(guid.unpack('H*').first, dashify: true) end private attr_reader :guid def oracle_raw16(string, dashify: false) # remove dashes string.delete!('-') # split every two chars parts = string.scan(/.{1,2}/) # re-order according to oracle format index and join oracle_format_indices = [3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11, 12, 13, 14, 15] result = oracle_format_indices.map { |index| parts[index] }.join('') # add dashes if requested return result if !dashify [ result[0..7], result[8..11], result[12..15], result[16..19], result[20..result.size] ].join('-') end end end